This is a story about phobia of the dark and many other mental illnesses, as well as love and redemption.
Qinglang, a clear and simple girl, met Qingcheng, an American boy with an awkward personality who was regarded as a monster on the Internet. Out of sympathy, she became his master, taught him Chinese and tried to cure him. Qingcheng suffers from a variety of mental illnesses, but is a master of programming. Although fragile and quirky, he protects Sunny in his own way. Because she longed for the world she lived in, Qingcheng sacrificed a lot to break through the dark restrictions and come to her side.
Qingcheng tried every means to cross the Internet, changed her identity and came to Qinglang, only to find that there was someone else beside her. A series of family conspiracies and workplace frame-ups surrounding his identity unfolded, challenging Qingcheng's fragile and unhealed spiritual world, as well as all the beauty in human nature.